Which is true of archaeans?

a. they are extremophiles

b. they are the cause of many human diseases.

c. structurally, they represent an intermediate form between bacteria cells and eukaryotic cells.

d. they have undergone horizontal gene

e. they include earth's first aerobic photosynthesizers

E.They include Earth's first aerobic photosynthesizers

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A

Explanation: archaens are classified as extremophiles

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

a community that experiences major changes undergoes progress